Hi, I'm a newbie to 'threads' & 'forums' so please bear with me.

I have a 5" MediaTek GPS unit that I bought from an Ebay trader in June last year. For a while, it worked really well, but in August, while it was running, it shut itself down & when I restarted it I got the error message "please set GPS path first". I can't get past that. The battery ran completely down & I'm not sure if that's what has caused this problem.
Can't get the navi to run & am desperate. Please can anyone help?
I've contacted the Ebay seller and after repeated requests for help over 5 months he finally sent me a disc which arrived last week. NO instructions at all and I'm not able to install. I can't find an exe. file and have tried 'sending' the info to the GPS while it's connected to my computer, but am failing miserably. I've noticed on the other threads that someone had a similar problem & seems to have fixed it but being a 'grey nomad senior' (no laughing please) I need step by step instructions.
Should I just bin it & buy one with a brand name, or is my unit 'fixable'?

The rest of the icons work ok.
Hoping someone can help.